Прочитайте текст и определите какой из заголовков соответствует тексту. Density specific weight is t...: ответ на тест 911474 - Английский язык

What is the density of water?
Density (specific weight) is the amount of mass in a unit volume. It is measured in kilograms per cubic metre. The density of water is 1000 kg/m3 but most materials have a higher density and sink in water. Aluminium alloys, with typical densities around 2800 kg/m3 are considerably less dense than steels, which have typical densities around 7800 kg/m3. Density is important in any application where the material must not be heavy.
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What is the density of water?

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What is the density of water?
Density (specific weight) is the amount of mass in a unit volume. It is measured in kilograms per cubic metre. The density of water is 1000 kg/m3 but most materials have a higher density and sink in water. Aluminium alloys, with typical densities around 2800 kg/m3 are considerably less dense than steels, which have typical densities around 7800 kg/m3. Density is important in any application where the material must not be heavy.

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Fatigue is the growth of cracks under stress. It occurs when a mechanical part is subjected to a repeated or cyclic stress such as vibration. Even when the maximum stress never exceeds the elastic limit, failure of the material can occur even after a short time. No deformation is seen during fatigue, but small localized cracks develop and propagate through the material until the remaining cross-sectional area cannot support the maximum stress of the cyclic force. Knowledge of tensile stress, elastic limits, and the resistance of materials to creep and fatigue are of basic importance in engineering.

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The combinations of two or more different materials are called composite materials. They usually have unique mechanical and physical properties because they combine the best properties of different materials. For example, a fibre-glass reinforced plastic combines the high strength of thin glass fibres with the ductility and chemical resistance of plastic. Nowadays composites are being used for structures such as bridges, boat-building etc.

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When you turn the handle of a water tap clockwise, the water stops. When you 1_______ it anticlockwise, the water pours out of the tap again. How does it work?
Look at FIG.2. The tap has a handle on the top and inside there is a 2_______, and a washer. The washer is over a hole.
When you turn the handle clockwise, this makes the bolt move downwards. The washer then covers the hole and stops the water.
When you turn the handle 3_______, the bolt moves upwards and the washer uncovers the hole again. This lets 4_______ flow through the tap again.

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CAUTION: A ladder can be a very 1_______ tool. Any of these accidents could happen to you. (a) The ladder could slip on an oily 2_______ and you could fall off; (b) the top could fall backwards; (c) a door could open and push the 3_______ backwards or to the side; (d) a metal ladder could touch an 4_______ wire and give you an electric shock; (e) a ladder could fall off boxes or drums.